package com.shu.auth.utils;

import lombok.extern.slf4j.Slf4j;
import org.codehaus.jackson.map.DeserializationConfig;
import org.codehaus.jackson.map.ObjectMapper;
import org.codehaus.jackson.map.SerializationConfig;
import org.codehaus.jackson.map.annotate.JsonSerialize;
import org.codehaus.jackson.map.ser.impl.SimpleFilterProvider;
import org.codehaus.jackson.type.TypeReference;

import java.io.IOException;

/**
 * json工具类
 */
@Slf4j
public class JsonMapper {

    private static ObjectMapper objectMapper= new ObjectMapper();
    static {
        //config
        //排除为空的字段
        objectMapper.disable(DeserializationConfig.Feature.FAIL_ON_UNKNOWN_PROPERTIES);
        objectMapper.configure(SerializationConfig.Feature.FAIL_ON_EMPTY_BEANS,false);
        objectMapper.setFilters(new SimpleFilterProvider().setFailOnUnknownId(false));
        objectMapper.setSerializationInclusion(JsonSerialize.Inclusion.NON_EMPTY);
    }

    /**
     * 对象转string
     * @param src
     * @param <T>
     * @return
     */
    public static  <T> String obj2String(T src){
        if (src==null){
            return null;
        }
        try {
            return src instanceof String ? (String)src : objectMapper.writeValueAsString(src);
        } catch (Exception e) {
            log.error("obj2String exception error:{}",e);
            //是否跑出异常由上层决定
            return null;
        }
    }

    /**
     * string转对象
     * @param src
     * @param typeReference
     * @param <T>
     * @return
     */
    public static <T> T string2Obj(String src, TypeReference<T> typeReference){
        if (src==null || typeReference==null){
            return null;
        }
        try {
            return (T)(typeReference.getType().equals(String.class)?src: objectMapper.readValue(src,typeReference));
        } catch (Exception e) {
            log.error("string2Obj exception ,String:{},TypeReference<T>{},error:{}",src,typeReference,e);
            return null;
        }
    }
}
